My back speakers wont produce any sound

The Kenwood KAC-7252 and KAC-9104D are both great amps, but they have different strengths and weaknesses. The KAC-7252 is a 5-channel amp that can output 75 watts per channel at 4 ohms. It also has a built-in crossover and time alignment, which can be helpful for getting the most out of your woofers. The KAC-9104D is a 4-channel amp that can output 100 watts per channel at 4 ohms. It also has a built-in subwoofer output, which can be used to power a separate subwoofer.
If you are looking for an amp that can power all of your speakers, the KAC-7252 is a great option. It is also a good choice if you want an amp with built-in crossover and time alignment. However, if you are looking for an amp that can power a subwoofer, the KAC-9104D is a better choice. It is also a good choice if you want an amp with more power output.
Ultimately, the best amp for you will depend on your specific needs and budget. If you are not sure which amp is right for you, it is always a good idea to consult with a professional car audio installer.
Here is a more detailed comparison of the two amps:
Kenwood KAC-7252

• 5-channel amp
• 75 watts per channel at 4 ohms
• Built-in crossover and time alignment
• MSRP: $399

Kenwood KAC-9104D

• 4-channel amp
• 100 watts per channel at 4 ohms
• Built-in subwoofer output
• MSRP: $499

I hope this helps!

it could be a indication of low amps.

Does it happen when car is running and lights are on?

If car is off do lights dim to the music at night?

You could be using more power than your alternator can supply.

Most alternators are capable of producing 55-65 amps. This is adequate for sound systems producing up to 350 watts RMS. Some more modern vehicles have alternators rated up to about 120 amps. This will be sufficient for systems of up to about 600 watts. Some pre-1985 cars, on the other hand, have alternators only rated for 35 amps. This will only support about 125 watts in amplifier power.


One easy, effective solution maybe installing a capacitor. Heavy-duty capacitors connect to the power cable (just before it reaches your amplifier) and act as a buffer zone between your amp and your car's electrical system. They store up a reservoir of power which can supply the amplifier's peak demands (like a bass drum beat) without having to draw current from the battery.

First, Check your earth is excellent and not all clustered on one point. Ensure power leads are thick and secure. Separate speaker and power cables.

Check auto turn on wire (thin blue on amp) is not connected to lights power source, use elect aerial output on head instead

Run 4 gauge earth wire to car body near amp, power cable must be heavy gauge too, expessally with a sub woofer running.

Is the sub dual voice coil?

channels mey be burned....does the amp smell like burnt electronics

Its not pulsing, its called clipping. The sound is being clipped due the amp being pushed past is power capacity and distorting the signal. This will damage your speakers very quickly. No amp should be turned more then 3/4 up. If its not loud enough you need to purchase a larger amp or be comfortable with the wattage it produces at 3/4 volume. You may also have speaker wires touching/crossed causing th issue.

do have ur remote wire connected to u amp wire on ur stereo if not connected there. check ur ground

HI DUDE UR REMOTE WIRE FUSE IS BURNT .... REPLACE IT ... AND UR SPEAKER ... OR SUB TAKES LOT POWER FROM AMP .... ....

You have blown outputs , faulty channels. What kind of amp do u have and what were u running to it? Most likely a bad amp, u might need a new one.

From the Input of amp, just connect cheap speaker with wires to input of amp.

If you have sound from speaker, most likely the amp is bad or loose connection.

unplug all speakers and see if it still into protect .If unit powers up normally without speakers , then hook up a temporary speaker directly to speaker out to see if you have output.If it works .Then check speaker cables and speakers for shorts.Also make sure you have good ground and main power and standy are present.